According to an article written by David at tmonews.com, the Samsung Galaxy Tab’s pricing details were discovered on an advertisement from a dealer partner of T-Mobile and not the actual main office itself.

If the info is correct, then it looks like you will be able to get it for the price of $399, for those that take a 2-year contract and after a $50 mail in rebate.

As a reminder, some specs for the Samsung Galaxy Tab are a 1024 x 600 screen with multi-touch support, integrated 1.3-megapixel webcam, as well as a rear-facing 5.0MP camera, Wi-Fi and up to 8-hours of battery life.